Question

我正在尝试对对象进行排序，然后使用已排序的数据创建一个新对象。但问题是，每当我将数据推送到空数组时，它就会创建一个父对象为0,1,2的新对象......

{
    "0": {
        "note-1502256197947": {
            "content": "If that doesn't work, then it will reload the entire page.",
            "fav": true,
            "last_modified": "",
            "publish_date": 1502256197947,
            "slug": "starred-note",
            "title": "Starred Note"
        }
    },
    "1": {
        "note-1502108241905": {
            "categories": {
                "Learn": true,
                "Wordpress": true
            },
            "content": "Creating a embed several routes to handle Creation, Retrieval",
            "fav": true,
            "last_modified": "",
            "publish_date": 1502108241905,
            "slug": "a-new-title",
            "title": "A New Title"
        }
    }
}

以下是我尝试对对象进行排序的方法：

      var noteref = firebase.database().ref(`noted${uid}/notes/`);
      var sortedKeys = [];

      noteref.orderByChild('fav').once("value", function(snapshot) {

          snapshot.forEach(function(child) {

              sortedKeys.unshift({[child.key]:child.val()}); 
              //sortedKeys[child.key] = child.val();  ***Works! but the order is lost
          });

          var newObject = {...sortedKeys};
          console.log(newObject);
      });

这是我尝试重新创建对象的方法：

{
  "note-1502256197947": {
            "content": "If that doesn't work, then it will reload the entire page.",
            "fav": true,
            "last_modified": "",
            "publish_date": 1502256197947,
            "slug": "starred-note",
            "title": "Starred Note"

  },
  "note-1502108241905": {
            "categories": {
                "Learn": true,
                "Wordpress": true
            },
            "content": "Creating a embed several routes to handle Creation, Retrieval",
            "fav": true,
            "last_modified": "",
            "publish_date": 1502108241905,
            "slug": "a-new-title",
            "title": "A New Title"
  }

}

Answer 1

我认为你缺少一些对象的概念。如果一个对象有几个属性，那么它并不意味着它以任何方式排序。

  {
   "note-1502256197947": {...
             },
   "note-1502108241905": {...
             }
}

假设这是一个对象。此对象有2个属性 note-1502256197947 和 note-1502108241905 。这并不意味着它们已被分类。

Answer 2

如果你想要对象格式的数据意味着为什么要将值推入数组？然后在foreach中制作格式之前更好的事情，

可能有两种格式化方式： 1.创建一个空对象并按预期生成格式，如下所示： snapshot.forEach（function（child）{

          sortedKeys[child.key] = child.val(); 
      });

2。正如你现在关注的那样

注意：通过调试确保来自api和foreach内部的数据是否正在进行

从嵌套对象中删除父键

2 个答案: